compute order locally in LPNormBase

In order to use a grid function with a norm, it is currently required to implement a space to determine the polynomial order used for integration. This small series of patches changes this to using the method order provided by the local function.

As a byproduct, the automatically selected quadrature order adapts to the local polynomial order for p-adaptive spaces.

Note: The method 'space' will still be needed, if one function passed to distance is not a grid function.